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Earthquake Resistance of Beam-Column Connections in Weak-Beam Strong-Column Reinforced Concrete Frames

弱梁强柱钢筋混凝土框架梁柱连接的抗震性能

基本信息

批准号：
60420040
负责人：
OTANI Shunsuke
金额：
$ 5.5万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

The shear transfer mechanism of a reinforced concrete interior beamcolumn joint was studied through the laboratory tests of plane specimens under reversed cyclic loading and the nonlinear finite element analysis. The joint shear transfer mechanism changes with bond deterioration along the beam reinforcement. When a good bond is maintained along the beam reinforcement, diagonal compressive stresses distribute uniformly within the joint panel. However, the compressive stresses come to concentrate on the joint main diagonal with the bond deterioration. The transverse reinforcement within the joint does not contribute to the shear resistance, but confines the joint core concrete.Three-dimensional beam-column joints with slabs were tested under the bi-directional loading reversals. The joint shear failure was not observed during the tests despite fo a high shear force input into the joint. The transverse beams framing into the joint and the slabs confined the joint core increasing the joint shear resistance.The earthquake resistant design criteria were proposed for interior beam-column joints taking into account the expected deformation limits of structures designed by the weak-beam strong-column concept. The bond deterioration along the beam reinforcement may be permitted to some extent, the limit which was determined on the basis of the nonlinear earthquake response analyses. The shear force input into the joint must be limited in proportion to the concrete compressive strength in order to prevent the joint shear compression failure after beam flexural yielding.

通过平面试件在反复荷载作用下的室内试验和非线性有限元分析，研究了钢筋混凝土内梁柱节点的剪力传递机理。节点剪力传递机制随粘结劣化程度的变化而变化。当梁筋保持良好的粘结时，对角压应力在节点板内均匀分布。然而，随着粘结性能的恶化，压应力逐渐集中在节点的主对角线上。节点内部的横向配筋对节点的抗剪性能没有贡献，但对节点核心混凝土起到了约束作用。在试验过程中没有观察到节点的剪切破坏，尽管节点受到很高的剪切力。节点中的横梁和板约束节点核心层，提高了节点的抗剪性能。考虑到按弱梁强柱概念设计的结构的预期变形极限，提出了内部梁柱节点的抗震设计准则。钢筋粘结劣化在一定程度上是可以允许的，这一界限是根据非线性地震反应分析确定的。为了防止梁弯曲屈服后节点的剪压破坏，必须将输入节点的剪力与混凝土抗压强度成正比加以限制。